THE NURSERY-LIST 375 



old piece attached. This plan may be used also for barkeria and 

 microstylis. It is well to remember that in any method of propaga- 

 tion in which the pseudobulb is divided, the vigor of the young 

 plant is proportionate to the amount of reserve material supplied it. 

 However suitable the external conditions may be for growth, it is 

 for some time entirely dependent for sustenance on the old piece 

 from which it springs. Dendrobium Phaloenopsis is a case in point. 

 If a pseudobulb is cut into, say, three pieces, it will take at least 

 two years for the young plants to reach flowering strength, but 

 frequently, by using the entire pseudobulb, one can get in a single 

 year a growth quite as large as the old one. 



Subsequent handling. The treatment of young orchids should be 

 founded on what suits the parents. As a rule, however, they require 

 more careful nursing, and some of the conditions must be modified. 

 Drought, intense light and cold drafts must be avoided. For 

 many orchids, especially those from equatorial regions, where the 

 atmospheric conditions alternate between saturation and intense 

 heat and dryness, it is necessary, in order to induce flowering, that 

 nature, to some extent at least, should be imitated. With young 

 plants, by whatever method they may be obtained, the supply of 

 water must only be reduced in accordance with the weather and 

 season, and beyond that, no attempt at resting made. In cases, 

 however, in which plants have been divided or made into cuttings, a 

 very limited supply of water is needed at first ; but to prevent ex- 

 haustion, the atmosphere should always be kept laden with moisture. 



Oreocereus. Cactaceoe. 



For propagation, see Cacti, page 261. 



Oreodoxa. Palmaceoe. 



Grown from seeds. See Palms, page 377. 



Oreopanax. Araliacece. 



Propagated by cuttings and seeds, from January to March. 

 Place half-ripened growths of extreme tops in a warm propagating- 

 bed with bottom heat of 80, cover with glass. Seed may be sown in 

 pans, with a mixture of loam, peat and sand ; cover with glass and 

 place over bottom heat. 



Origanum (Marjoram). Labiates. 



Increased by seeds, which should be shaded until the plants are 

 well rooted. For 0. vulgare, division in spring or early autumn is 

 usually practiced. 



